25 HRIS APIs to Integrate With in 2026: Workday, BambooHR, ADP and Unified HR Integration APIs
March 11, 2026
Human Resource Information Systems (HRIS) sit at the center of modern workforce infrastructure. They manage employee records, payroll data, organizational structures, benefits, time-off balances, and much more. As SaaS products increasingly integrate with HR platforms to automate onboarding, identity provisioning, workforce analytics, and payroll workflows, HRIS APIs have become a core part of product architecture.
But integrating HR systems is rarely simple.
Every HR platform exposes different APIs, authentication flows, schemas, rate limits, and event systems. Building integrations across Workday, BambooHR, ADP, and dozens of other systems quickly becomes a major engineering burden.
In this guide, we'll cover 25+ HRIS APIs developers commonly integrate with, the challenges of building HR integrations, and why many SaaS companies now rely on Unified HR APIs to scale integrations across hundreds of workforce systems.
What Is an HRIS API?
An HRIS API allows software applications to access employee and workforce data programmatically.
Typical HRIS APIs expose endpoints for:
- Employee records
- Organizational groups or departments
- Locations and offices
- Payroll and payslips
- Benefits and deductions
- Time-off balances and PTO requests
- Work schedules and timesheets
- Devices and assets assigned to employees
These APIs enable SaaS products to build workflows such as:
- employee onboarding automation
- identity and access provisioning
- HR analytics dashboards
- payroll synchronization
- workforce planning tools
- employee directories and org charts
However, every HR vendor structures these APIs differently, which creates significant complexity for developers.
Why SaaS Products Integrate with HRIS APIs
Many SaaS products rely on HR integrations to deliver key features.
Common use cases include:
Employee onboarding and offboarding automation
Automatically create user accounts in SaaS tools when a new employee appears in an HR system, and revoke access when employees leave.
Identity and access management
Sync employee roles, departments, and reporting structures to enforce access policies across tools like Okta or Active Directory.
Employee directories and org charts
Display up-to-date workforce information inside collaboration tools, intranets, or productivity apps.
Benefits and payroll integrations
Sync compensation, benefits eligibility, and deductions across payroll and finance systems.
HR analytics and workforce insights
Pull employee data into analytics platforms to track headcount, turnover, and workforce planning metrics.
Because HR systems often act as the system of record for employee data, integrating them is essential for many SaaS platforms.
25+ HRIS APIs Developers Integrate With
There are hundreds of HR and workforce management platforms available today. Below are some of the most commonly integrated HRIS APIs used by SaaS products.
Workday API
Workday Developer API documentation
Workday is one of the most widely used enterprise HR systems. Its APIs allow developers to access employee records, organizational hierarchies, payroll information, and benefits data.
Key capabilities include:
- worker and employee profiles
- payroll and compensation data
- organizational structures
- recruiting and talent management
- reporting APIs
Workday integrations are common in enterprise SaaS products but can be complex due to SOAP and REST API variations.
BambooHR API
BambooHR is a popular HRIS platform for mid-market companies. Its REST API provides access to employee records, time-off requests, company directories, and custom employee fields.
Typical endpoints include:
- employee profiles
- time-off requests and balances
- job information
- company directory data
- employee lifecycle changes
ADP Workforce Now API
ADP Workforce Now is one of the largest payroll and HR platforms globally. Its APIs allow SaaS products to retrieve payroll records, employee information, and workforce data.
Capabilities include:
- payroll data and pay statements
- worker records
- benefits enrollment
- time and attendance
- tax and compliance reporting
ADP integrations often require partner access and enterprise authentication flows.
Rippling API
Rippling combines HR, payroll, device management, and identity provisioning into a unified workforce platform.
Its APIs enable automation for:
- employee lifecycle events
- device and application provisioning
- payroll data
- benefits and deductions
Rippling is commonly used for IT provisioning workflows triggered by HR events.
Personio API
Personio is widely used by European companies for HR management.
The Personio API provides endpoints for:
- employee records
- absences and time off
- departments and teams
- payroll attributes
Personio is often integrated into workforce analytics and HR automation tools.
HiBob API
HiBob provides modern HR infrastructure for scaling companies.
Its API allows access to:
- employee profiles
- company structures
- lifecycle events
- custom employee attributes
HiBob is frequently used by global startups and scale-ups.
UKG API
UKG (Ultimate Kronos Group) provides workforce management and HR platforms including UKG Pro and UKG Ready.
Common integrations include:
- employee records
- workforce scheduling
- payroll
- attendance tracking
Ceridian Dayforce API
Ceridian Dayforce is another enterprise workforce platform used for payroll and scheduling.
Its APIs expose:
- employee information
- time and attendance data
- payroll information
- HR reporting endpoints
Gusto API
Gusto provides payroll and HR tools for SMBs. Its API supports integrations for payroll automation, employee data, and benefits.
Common use cases include:
- payroll processing
- employee onboarding
- tax reporting
- contractor payments
Deel API
Deel focuses on global payroll and contractor management. Its APIs enable SaaS products to automate onboarding and payroll for international teams.
Capabilities include:
- contractor and employee management
- payroll payments
- compliance workflows
- global hiring support
Additional HRIS APIs
Beyond the major platforms above, SaaS companies often integrate with many other HR tools, including:
- Namely
- Paychex
- Paylocity
- Paycor
- Humaans
- Lattice
- Leapsome
- Culture Amp
- Deputy
- Humanforce
- Remote
- TriNet Zenefits
- Workable
The HR ecosystem is extremely fragmented, which means supporting customers often requires integrating dozens of HR systems simultaneously.
Challenges When Integrating HRIS APIs
Building HR integrations directly with each provider introduces several challenges.
Different authentication systems
Some HR APIs use OAuth, others rely on API keys or custom authentication.
Inconsistent data models
Employee records, job titles, departments, and benefits fields vary widely between vendors.
API version changes
HR providers frequently update their APIs, requiring ongoing maintenance.
Rate limits and pagination
Each provider enforces different limits and pagination rules.
Webhook and event differences
Some systems support real-time webhooks while others require polling.
Compliance requirements
Employee data often contains sensitive personal information, requiring strict privacy controls and data residency considerations.
As companies integrate with more HR systems, this complexity grows exponentially.
The Role of Unified HR APIs
To reduce this complexity, many SaaS platforms adopt Unified HR APIs.
A unified API standardizes data models and authentication across multiple HR providers so developers can integrate once and support many platforms.
Instead of building separate integrations for Workday, BambooHR, ADP, Personio, and dozens of others, a unified API layer provides:
- a single authentication flow
- normalized employee data models
- consistent API endpoints
- standardized webhooks and events
- automatic handling of vendor API changes
This dramatically reduces integration complexity.
Build Once with the Unified HRIS API
The Unified HRIS API allows developers to access workforce data across 224+ HR and directory integrations through one standardized API.
You can explore the full list here: Unified HRIS API integrations
Unified normalizes HR data across platforms like Workday, BambooHR, ADP, Personio, HiBob, and many others.
Unified HR Data Objects
Unified provides consistent objects across all supported HR systems:
Employee
Employee profiles, employment status, compensation, and contact information.
Groups
Departments, teams, divisions, and organizational units.
Locations
Office locations and geographic data.
Time Off
Vacation, PTO balances, and leave requests.
Payslips
Payroll information and compensation details.
Benefits
Health insurance and benefits enrollment.
Deductions
Payroll deductions and tax withholdings.
Devices
Company-issued devices assigned to employees.
Time Shifts
Work schedules and shift assignments.
Bank Accounts
Employee payroll payment accounts.
Each object supports consistent methods:
- create
- list
- retrieve
- update
- remove
This allows developers to build workforce features once and support many HR platforms.
Real-Time Data Access
Unlike integration systems that rely on cached datasets or periodic sync jobs, the Unified HRIS API uses a real-time pass-through architecture.
Every request hits the source HR system directly.
This means:
- no cached employee data
- no stale records
- real-time employee updates
- lower compliance risk for sensitive workforce data
Zero Data Storage
Unified never stores employee data.
Requests are processed statelessly and routed directly to the HR provider. Traffic is regionalized across US, EU, and AU environments to support data residency requirements.
Faster HR Integrations
Using a unified API, teams can ship HR integrations much faster.
Instead of building and maintaining separate integrations for dozens of HR platforms, developers can integrate once and support 224+ HR systems immediately.
Final Thoughts
HRIS APIs power many critical SaaS workflows, from employee onboarding automation to payroll integrations and workforce analytics.
But integrating HR systems individually can quickly become a complex and expensive engineering challenge.
As the HR ecosystem continues to grow, many SaaS companies are adopting Unified HR APIs to simplify integration development and support hundreds of workforce platforms through a single API.
If you're building a product that connects to HR systems, unified APIs provide a scalable way to support Workday, BambooHR, ADP, and hundreds of other HR platforms without maintaining dozens of separate integrations.